<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
    <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js"></script>
</head>
<body>
<label for="username"></label><input name="username" , id="username" , type="text">
<label for="pwd"></label><input name="pwd" , id="pwd" , type="password">
<button>登录</button>
</body>
<script>

</script>
</html>